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Old 06-20-2005, 05:03 PM   #1
Pastorino
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Registered: Jul 2004
Distribution: RHEL 6.2
Posts: 35

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SendMail relay open if 'from' and 'to' match domain


I'm using Fedora Core 1, with SendMail 8.12.10.

The relay is closed, except for the company's internal network, which is 10.0.0.0/24.

But there's one flaw: if I connect to the Internet from home, and I send a message using the company's sendmail as relay, from user1@mydomain.com to user2@mydomain.com, the server accepts it.

So my users are receiving loads of spam from spammers who identify themselves as userx@mydomain.com, and worse, using our own server as relay.

I thought that this would only happen if I configured sendmail with:

FEATURE(relay_local_from)

but this is not the case.

Does anyone know how to solve this?

Thanks,

Carlos

Last edited by Pastorino; 06-20-2005 at 05:04 PM.
 
  


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